Eating 500 calories a day and burning 400?

So the net calorie per day would be 0. Technically if you only burned 500 and only ate 500, you wouldn't lose any weight. There has to be a DEFICIT (meaning negative) amount of calorie intake in order to lose weight.

HOWEVER, you would lose more calories than 500 just by sitting around. Edit: If your BMR is about 1500 and you ate 500 calories a day, and burned 500 calories, your deficit would be 1500 calories per day. A pound of fat is approximately 3500 calories.

So assuming you had -1500 calories per day, it would be 7*1500 = -10500 calories in a week. You will lose about 3 pounds per week.

You wouldn't be able to sustain this regime. You need about 1500 Calories not to burn muscle and to not have your metabolism shut down. So if you only ate 500 Calories you're not even providing enough energy for your body to function properly.

If you then when on to burn 500 you'd make the situation worse. If you want to lose weight and you want to do 500 Calories of exercise then you should consume about between 2000 and 2500 Calories. That would allow you to burn fat at the optimum rate.

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